SAASM Military Time & Frequency Systems

FEI-Zyfer offers SAASM GPS military time and frequency systems with two SAASM receiver options. Both SAASM GB-GRAM and SAASM MRU receivers are available for different military applications. Each SAASM receiver is coupled with FEI-Zyfer’s proven crystal (OCXO) or Rubidium (Rb) oscillators to ensure stable holdover and output in the event of SAASM signal or other external reference signal loss.

 Modular systems include support for multiple input and output modules including 1PPS, IRIG, HAVE QUICK, PTTI, IEEE-1588 PTPv2, low phase noise 1, 5, and 10MHz sine wave as well as custom outputs. Dual Redundant modular systems (CommSync II & CommSync II-D) may be configured with two SAASM GPS Time & Frequency (GTF) modules and two power supply modules (AC and/or DC power) for redundancy with uninterrupted automatic switchover.

Monitor and Control functions are via an RS-232 communications port, a front panel keypad and display, as well as optional Ethernet plug-in modules providing Telnet, SNMP, PTPv2, and NTP. Zyfer Monitor (FEI-Zyfer's remote access utility) provides complete remote control, including system status, setup, alarm logging and user management over a standard TCP/IP connection.

The NanoSync IV-SA-Rb has been demonstrated to be compliant to the Joint Airborne SIGINT Architecture (JASA) Version 3.0, Annex 1, for Time, Frequency, Navigation and Geodesy (TFNG), making it suitable for Electronic Warfare (EW) COMINT and ELINT applications in fixed site, airborne and shipboard environments.

What is Direct P(Y) acquisition?
The pre-SAASM GPS receiver technology requires the Civil C/A-Code signal to facilitate the acquisition of the crypto
P(Y)-Code signal. In addition to a properly keyed receiver, the C/A signal provides the receiver with precision time and other parameters needed to acquire the P(Y) signal. The Hot Start acquisition functionality bypasses this need, able to come on-line in the absence of the Civil, in-the-clear C/A signal. This is a vital function of the SAASM receiver technology, because in today's tactical warfare scenarios, the C/A signal may not be available in the local area of conflict.

Why use GPS SAASM in time/frequency product applications?
Many existing communications and data networks used by the government and DoD receive precision time and frequency from GPS-C/A-aided synchronization products. GPS-C/A signals/receivers can be easily jammed or degraded, causing degradation or loss of synchronization and communications, unacceptable in vital applications. The use of GPS-SAASM receivers prevents such loss of synchronization. Although GPS-SAASM receivers are “controlled items,” they are not classified. Only U.S. Government and its NATO partners are authorized to use such military receivers.